ISSN:
1432-0495
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract Land disposal or dumping of hazardous wastes poses serious environmental and health hazards: soil and water pollution, gaseous release, and various kinds of contamination. In order to evaluate sites for hazardous-waste landfill, the BRGM has developed two methods for in situ measurements of very low permeability, equal or less than 1.10−9m/s. Both methods need only light equipment and the tests are simple to perform. The first method is the double-ring method with inductive transducer. The sensitivity of this method was increased by measuring the infiltration rate in the inner ring with a float, whose displacement is followed by an inductive transducer. Data are corrected for the influence of water and metal dilation, and for change of viscosity with temperature. The accuracy of this method allows measurement of vertical permeability between 1.10−5 and 1.10−9m/s. The second method is the pulse-test method. In this method, a well is suddenly pressurized by injecting water, followed by sealing. The decline of pressure with time is recorded and the data are used to calculate the permeability in the test interval. The equipment is specially designed for surface investigations in clay formations with values of permeability in the range 1.10−7m/s to 1.10−11m/s.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01666568
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